BEIRUT (Reuters) – The Syrian army unleashed a massive bombardment against one rebel enclave on Monday and prepared for the withdrawal of insurgents from another as President Bashar al-Assad pushes to crush the rebels last besieged strongholds.
However, missile strikes against several government military bases on Sunday – not claimed by any party despite speculation in Israel that its military was responsible – underscored the risks of a wider escalation in the seven-year conflict.
There were more than 140 Syrian army air strikes on the town of Rastan and surrounding villages in the rebel enclave between the cities of Hama and Homs early on Monday, alongside sustained shelling, the Syrian Observatory for Human Rights monitor said.
Last week a Syrian government minister said the enclave would be the army s next target after it retook all rebel areas around the capital, a goal it looked closer to achieving with Monday s expected insurgent pullout from south Damascus.
Later on Monday, Syrian state TV said the army would cease fire for 48-72 hours in the pocket between Homs and Hama – the most populous remaining encircled area in Syria – to allow rebel groups to agree a surrender deal under which they would leave for opposition-held areas in northern Syria.
The ceasefire would be the last deadline before “the military operation begins”, state TV said.
The Observatory said fighting had stopped there by late Monday afternoon.
Despite Assad s ever-stronger position against rebels since Russia s entry into the war in 2015 brought a string of battlefield victories, the involvement of numerous regional and global powers threatens to inflame the war further.
Nobody has claimed responsibility for the missile attacks that struck several bases near Hama and Aleppo overnight, causing large explosions, and the Syrian army blamed only “aggression” by its enemies.
However, Israel has previously carried out strikes in Syria to stop Assad s ally Iran getting stronger there or transferring weapons to the Lebanese group Hezbollah, and there is widespread speculation in Israel that it was behind the attack.
Israeli Intelligence Minister Israel Katz would not comment on the strikes, but added that Israel “has made it unequivocally clear at all levels that it will not allow an Iranian front in Syria to be established”.
A spokesman for Israel s military said it would not comment on foreign reports. But Amos Yadlin, a former head of Israeli military intelligence, said Israel was likely behind the strikes.
“Israel has to decide: Are we confronting Iran in Syria before they have full advanced weapons capabilities … or do we wait…, let them build a huge military capability in Syria and meet them in a future war and pay a very high price?”
Diplomats have warned of a possible major escalation between Israel and Iran in Syria as Assad and his allies take more territory from rebels.
The United States, Jordan and Assad s main ally Russia have declared a ceasefire zone in southwest Syria, near the border with Israel, and on Monday Secretary of State Mike Pompeo said Washington s strategy there “remains unchanged”.
The Observatory said at least 26 people – mostly Iranians and members of an Iran-backed Iraqi militia – were killed in Sunday s air strikes, and that dozens more people were missing.
Speaking in Israel on Sunday, Pompeo said the United States was “deeply concerned about Iran s dangerous escalation of threats towards Israel and the region” and said it was critical for the two allies to work together to stop it.
The semi-official Iranian news agency Tasnim said no Iranian base had been hit or Iranians killed. Alaeddin Boroujerdi, a senior Iranian member of parliament, met Assad on Monday and said Tehran would keep military advisers in Syria until the war ended.
Iran and its allies blamed Israel for an April 9 air strike on the Tiyas air base in Syria in which several Iranian military personnel were killed, and Iran has warned it would not go “without response”.
The Syrian army s assault on the pocket between Homs and Hama included air strikes and artillery, according to the Britain-based Observatory.
Reinforcements arrived in government-held areas before the bombardment, which targeted Rastan, the biggest town in the pocket, and several nearby villages, the Observatory said.
Syrian rebels control large swathes of both northwest and southwest Syria. An alliance of Kurdish and Arab militias backed by the United States holds large parts of northern and eastern Syria after an offensive against Islamic State last year.
The pocket in southern Damascus is split between areas held by Islamic State and rebel groups. It has been the focus of a massive bombardment and intense fighting since the Syrian army recaptured eastern Ghouta earlier in April.
Late on Sunday, state media reported that rebel groups there had agreed to withdraw to opposition-held Idlib province in northwestern Syria.
State media did not say which rebel groups were included, but a rebel source said the deal was with the jihadist Tahrir al-Sham alliance, which includes Syria s former al-Qaeda affiliate.
Another rebel confirmed media reports that Free Syrian Army (FSA) fighters in another part of the enclave had also agreed to leave for northern Syria.
Footage on state television on Monday showed what it said was preparations for the withdrawal, along with the departure of buses in northern Syria to evacuate civilians from two government-held villages besieged by insurgents.
The surrender deal for Tahrir al-Sham in south Damascus was part of a deal to allow about 5,000 people to leave the two government-held Shi ite villages, al-Foua and Kefraya, it said.
The UN says around 8,100 people are besieged in al-Foua and Kefraya.
However, SANA state news agency reported continued intensive bombardment of al-Hajar al-Aswad, another area in the south Damascus pocket where Islamic State militants are based.
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